Name

trunc, truncf, truncl — round to integer, towards zero

Synopsis

#include <math.h>
double trunc( double   x);
float truncf( float   x);
long double truncl( long double   x);
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
trunc(), truncf(), truncl():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
or cc -std=c99
[Note] Note

Link with −lm.

DESCRIPTION

These functions round x to the nearest integer not larger in absolute value.

RETURN VALUE

The rounded integer value. If x is integral, infinite or NaN, x itself is returned.

ERRORS

None.

CONFORMING TO

C99.

SEE ALSO

ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)

COLOPHON

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